"I have great respect that the FBI now has the courage to right the horrible mistake they made. This was a grave miscarriage of justice that the American people fully understood and everyone's hope is that it is about to be corrected."

He added that "Hillary Clinton's corruption is on a scale we have never seen before. We must not let her take her criminal's scheme into the oval office."

The FBI told Congress Friday it is investigating whether new emails that may contain classified information have emerged in its probe of Clinton's private server, an unexpected announcement that surfaced less than two weeks before the presidential election. The FBI said in July its investigation was finished.

The Republican nominee has held five rallies in Maine this campaign, giving the state an unusual amount of attention. Trump stands to win at least one electoral college vote if the northern half of the state votes Republican.

Maine is one of just two states with a "split" electoral vote, instead of the usual winner-take-all allocation.

"We are going to win Maine, and we're going to win the White House," he said.

Trump is scheduled to speak in Lisbon, Maine, later on Friday as he seeks to win at least one of the state's four electoral votes. Maine is one of two states that split their electoral votes.